centos7下opencv3.4安装

配置好epel源

yum -y install epel-release

1. yum install gcc gcc-c++  
2. yum install cmake  
3. yum install python-devel numpy 

opencv的依赖项

yum install ffmpeg-devel

安装opencv

1. $cd opencv  
2. $madir release     
3. $cd release  
4.   
5. $cmake -D WITH_TBB=ON -D WITH_EIGEN=ON ..    
6. $cmake -D BUILD_DOCS=ON -D BUILD_TESTS=OFF -D BUILD_PERF_TESTS=OFF -D BUILD_EXAMPLES=OFF ..    
7. $cmake -D WITH_OPENCL=OFF -D WITH_CUDA=OFF -D BUILD_opencv_gpu=OFF -D BUILD_opencv_gpuarithm=OFF -D BUILD_opencv_gpubgsegm=OFF -D BUILD_opencv_gpucodec=OFF -D BUILD_opencv_gpufeatures2d=OFF -D BUILD_opencv_gpufilters=OFF -D BUILD_opencv_gpuimgproc=OFF -D BUILD_opencv_gpulegacy=OFF -D BUILD_opencv_gpuoptflow=OFF -D BUILD_opencv_gpustereo=OFF -D BUILD_opencv_gpuwarping=OFF ..    
8. $cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local ..  
9.   
10. $make  
11.   
12. $sudo make install

安装好后需要加动态库配置：
/bin/bash -c 'echo "/usr/local/lib" > /etc/ld.so.conf.d/opencv.conf'

然后加载动态库：

ldconfig

 #include
 #include
 #include

 int main(int argc,char *argv[])
 {
     cv::Mat image;
     image=cv::imread("1.png");

     cv::namedWindow("1.png");
     cv::imshow("1.png",image);

     cv::waitKey();
     return 0;
 }

编译前设置pkgconfig路径：
export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig/

然后用g++编译：

 g++ -g -o test test.cpp `pkg-config --cflags --libs opencv`

运行：

./test